引水隧洞施工爆破对上覆滑坡体的影响研究

发布时间：2018-03-23 00:19

本文选题：爆破　切入点：振动位移　出处：《中国农村水利水电》2017年08期 　论文类型：期刊论文

【摘要】：基于爆破荷载的等效施加方法,采用动力有限元法对水电站引水隧洞施工爆破振动效应进行数值模拟,选择有代表性的特征点,分析爆破作用下振动位移、速度、加速度特性以及不同爆心距部位的振动及衰减规律,利用Geo Studio计算施工爆破前后丹巴滑坡的稳定安全系数,探明爆破振动对丹巴滑坡体的稳定性影响。结果表明:离爆源的距离越近,质点的振动响应越大,且振动衰减也较快,当爆心距足够大时,水平向的振动幅值和铅直向值差不多,此时爆破产生的振动影响很小。振速峰值在爆心距15 m以内衰减速率最快,在爆心距100 m范围外,振速峰值小于0.2 cm/s。刚体极限平衡法和有限元法两种方法计算得到的滑坡稳定安全系数均满足规范要求,即隧洞爆破不会对丹巴滑坡体的稳定和安全造成危害。
[Abstract]:Based on the equivalent application method of blasting load, the dynamic finite element method is used to simulate the blasting vibration effect of hydropower diversion tunnel construction, and the representative characteristic points are selected to analyze the vibration displacement and velocity under blasting action. The acceleration characteristics and the vibration and attenuation law of different blasting center distance are calculated by using Geo Studio to calculate the safety factor of Danba landslide before and after blasting. The effect of blasting vibration on the stability of Danba landslide is investigated. The results show that the closer the distance from the detonation source is, the larger the vibration response of the particle is and the faster the vibration attenuation is. The amplitude of horizontal vibration is about the same as that of vertical direction, and the vibration produced by blasting has little effect. The peak value of vibration velocity is the fastest within 15 m of the distance between the center of explosion and 100 m from the center of explosion. The peak value of vibration velocity is less than 0.2 cm / s 路s. Both the limit equilibrium method of rigid body and the finite element method have been used to calculate the landslide stability safety coefficient, which means that the tunnel blasting will not cause harm to the stability and safety of Danba landslide body.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室水利水电学院;
【基金】：国家重点基础研究发展计划(973)项目(2015CB057903) 国家自然科学基金资助项目(51079092)
【分类号】：TV223;TV554

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